Andrew, the locks don't work from the drivers door or don't work from either door? It's usually the master control on the drivers door that goes bad and on a lot of them the switch on the passenger's door is wired through the drivers door switch same as with the master window control. I think you will find the switch on the drivers door bad.
Testimonial: "yes the locks dont work from either switch, or the key fob button. all i get is a click from the relay inside int. fusebox everytime i press the lock or unlock button. I tested everything with a mechanic he said the switches were good i changed the relay inside the fuse box and iit still clicks"
If your relay clicks that's a good thing however you still need to double check it you see 12 v is going in on the small blades powering the coil making it open connect allowing higher amperage 12 v to power the motors they need a lot of juice .Unplug the relay you will need jumper wires and a cheap muilty meter attach the small terminals to the battery it will open witch will make the wider terminals connect and send power to the drivers door master control. I f you have power their its most likely a bad connection water snow salt you just have to take it apart they wiggle wires at connectors before you rip to much apart
Testimonial: "The terminal connectors were tested at the switch, at the actuator and the actuator was jumped with the battery and everything worked. Also I changed the relay built into the interior fuse box Tyco 15418991. I put a new one in soldered and everything. The problem I’m having is that it still clicks and there isn’t a relay you can just change and unplug for the door locks like the older silverados"
SOURCE: Center Differential Lock Stuck
Yes it will, once no power is going to it it should or it could remain locked as well Give it a try . But you should have a look at the relay
1 2
3 4
that is what the pins should look lik 1 - 4 should power it
try grounding pins 1 - 4 this should lick or unlock the diff..
SOURCE: Power windows, locks, and seat not working
That Clicking should be a Bad Relay Switch. See if you can Locate it and Replace it. It should fix this Problem for ya! Please Rate My Response! Thanks!
SOURCE: where is the door lock relay located on a 1999
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